Computed Tomography Vs. Endoscopy Study

"Pelvic CT scan with i.v. and rectal contrast (Siemens Healtheneers, Erlangen, Germany) with the following scan parameters: collimation 0.6 mm, pitch 1.2 mm, CareKV with reference 120 mAs and reference 120 kV, rotation time 0.5 sec. Portal venous phase (individually tailored contrast media injection of Xenetix 300, Guerbet GmbH) and rectal contrast (500cc: 470cc water + 30cc Telebrix® gastro, a water soluble iodinated contrast agent, Guerbet GmbH).~Endoscopy takes 5 minutes: A gastroscope with a diameter of 10mm is used for inspection of anus, rectum, anastomosis incl. measurements (distance to dentate line, diameter of anastomosis) and distal part of colon (to rule out ischemia) during short term insufflation of the rectum with CO2. No biopsies are taken. Digital photo documentation will be provided. In case of anastomotic insufficiency: optional sedation of patient and clip closure with endoscopic OTSC (over the scope clip) system."